To test for protein, you added Biuret solution and observed color changes. Suppose that the color data below was observed.
The data above indicate an error. How do you know? What might have caused the error?
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Biuret is a blue color reagent that changes its color to pink/purple whenever it detects protein in a sample. Water don't contain proteins so it should not show pink/purple color instead it should maintain the blue color. Food items generally contain proteins so it show pink/purple color but it showed blue color.
Error might have caused by wrong marking of the samples, test tube marked with Water might contain a mystery food while Mystery food tube might contain water.
Explanation:
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